Infantry and Tanks are the basic attack units seen in all Nintendo Wars games. The ones seen in Brawl are red, which is one of the four colors which are given to a player based on player order (1st player - red, 2nd player - blue, 3rd player - green, 4th - yellow). Infantry have the least amount of power and have low mobility, but are useful in that they can capture enemy bases and conquer buildings. Tanks have more power than infanty, and their mobility is considerably higher, are weaker compared to other vehicles, such as the Medium Tank and Artillery. Advance Wars, Advance Wars 2, and Advance Wars: Dual Strike all use the same sprites for each unit.

The sound that plays when Infantry and Tanks are summoned first appeared in the intro for the Famicom game Famicom Wars. [1]

Infantry & Tanks is one of six Assist Trophies that needs to be unlocked before it can be used.
Upon being unleashed from the trophy, GBA sprites of Soldiers and Tanks will emerge, shooting bullets and missiles, which will damage any opposing players. While the soldiers and tanks are marching around, an air-raid siren will sound. Much like Excitebikes and Lakitu & Spinies, this Assist Trophy is represented by actual sprites from a game they appeared in other than Brawl.

Units first introduced in Famicom Wars, where they fight battles against enemy forces. Infantry are the least expensive to deploy of all units. They're not too strong, but they move well and can capture property. There are two tank types: tank A, which is expensive but has good mobility and firepower, and tank B which is cheaper but can change battles with sheer numbers.

Two units from the Advance Wars series, infantry are best for capturing bases and tanks for fighting the enemy. If summoned, these two form up on the player who activated them. Don't underestimate them just 'cause they're pixels—the infantry's gun and tank's cannon are formidable.

Two units from Famicom wars. In this game, they'll appear in pixel form on both sides of the character that called them up. The infantry then fire their guns while the tanks use cannon fire and drive into people. Cute as they are, don't underestimate them or you'll find yourself in a world of hurt!

These particular units are members of the Orange Star army, which has been the main force of the series since Advance Wars on the GBA.

Although the Assist Trophy is in sprite form, the bullets from the tanks are in 3-D form.

Despite a Headquarters building being prominently featured in the Infantry & Tanks design on the DOJO!! website and even their in-game Trophy in Brawl, the HQ never appears when the characters are actually summoned during a match.

Infantry and Tanks are one of 5 Assist Trophies to have appeared since Brawl, but absent in Ultimate.